CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
EPSS
Percentile
5.1%
A deadlock flaw was found in the Linux kernel’s BPF subsystem. The fail happens in the function sock_hash_delete_elem. This flaw allows a local user to potentially crash the system.
The default Red Hat Enterprise Linux kernel prevents unprivileged users from being able to use eBPF by the kernel.unprivileged_bpf_disabled sysctl.
This would require a privileged user with CAP_SYS_ADMIN or root to be able to abuse this flaw reducing its attack space.
For the Red Hat Enterprise Linux 7 the eBPF for unprivileged users is always disabled.
For the Red Hat Enterprise Linux 8 or 9 to confirm the current state, inspect the sysctl with the command:
The setting of 1 would mean that unprivileged users cannot use eBPF, mitigating the flaw.
A kernel update will be required to mitigate the flaw for the root or users with CAP_SYS_ADMIN capabilities.
Note: A fix for this CVE may be backported as a part of one of the future BPF subsystem rebases.